Yoon Junro, Choi Dong Joo, Kim Young-Ho
Division of Materials Science and Engineering, College of Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Ku, Seoul 133-791, South Korea.
J Nanosci Nanotechnol. 2011 Jan;11(1):796-800. doi: 10.1166/jnn.2011.3174.
We investigated the formation of CuO or Cu2O nanoparticles in the thick polyimide films by oxidizing Cu nanoparticles at various temperatures during the post heat-treatment. Cu nanoparticles of 4-5 nm in diameter were initially formed in the polyimide film by the reaction between a Cu film and a polyimide precursor, polyamic acid, and a following thermal curing in a reducing atmosphere. After the subsequent post heat-treatments in oxidizing atmospheres, X-ray diffraction patterns revealed that initial metallic Cu nanoparticles were transformed to Cu2O or CuO nanoparticles depending on the temperature during the post heat-treatment. Cu nanoparticles were oxidized to Cu2O during the post heat-treatment at low temperature while Cu nanoparticles were oxidized to CuO during the post heat-treatment at high temperature. Cross-sectional TEM studies showed that about 4.7 nm sized Cu2O nanoparticles or 4.7-5.2 nm sized CuO nanoparticles were fabricated in a thick polyimide film depending on the post heat-treatment condition. In the optical absorption measurements, the absorption peak from surface plasmon resonance of Cu nanoparticles disappeared during the post heat-treatment in an oxidizing atmosphere.
我们通过在后续热处理过程中于不同温度下氧化铜纳米颗粒，研究了厚聚酰亚胺薄膜中氧化铜或氧化亚铜纳米颗粒的形成。直径为4 - 5纳米的铜纳米颗粒最初通过铜膜与聚酰亚胺前体聚酰胺酸之间的反应，并随后在还原气氛中进行热固化，在聚酰亚胺薄膜中形成。在随后于氧化气氛中的后续热处理后，X射线衍射图谱表明，初始的金属铜纳米颗粒根据后续热处理过程中的温度转变为氧化亚铜或氧化铜纳米颗粒。在低温后续热处理过程中铜纳米颗粒被氧化为氧化亚铜，而在高温后续热处理过程中铜纳米颗粒被氧化为氧化铜。横截面透射电子显微镜研究表明，根据后续热处理条件，在厚聚酰亚胺薄膜中制备出了尺寸约为4.7纳米的氧化亚铜纳米颗粒或尺寸为4.7 - 5.2纳米的氧化铜纳米颗粒。在光吸收测量中，在氧化气氛中的后续热处理过程中，铜纳米颗粒表面等离子体共振的吸收峰消失。
